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diff --git a/web/core/modules/simpletest/src/Tests/SimpleTestBrowserTest.php b/web/core/modules/simpletest/src/Tests/SimpleTestBrowserTest.php
new file mode 100644
index 000000000..7e4f9125b
--- /dev/null
+++ b/web/core/modules/simpletest/src/Tests/SimpleTestBrowserTest.php
@@ -0,0 +1,148 @@
+<?php
+
+namespace Drupal\simpletest\Tests;
+
+use Drupal\Core\Url;
+use Drupal\simpletest\WebTestBase;
+use Drupal\Tests\simpletest\Functional\ThroughUITest;
+
+/**
+ * Tests the Simpletest UI internal browser.
+ *
+ * @group simpletest
+ */
+class SimpleTestBrowserTest extends WebTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = ['simpletest', 'test_page_test'];
+
+  protected function setUp() {
+    parent::setUp();
+    // Create and log in an admin user.
+    $this->drupalLogin($this->drupalCreateUser(['administer unit tests']));
+  }
+
+  /**
+   * Test the internal browsers functionality.
+   */
+  public function testInternalBrowser() {
+    // Retrieve the test page and check its title and headers.
+    $this->drupalGet('test-page');
+    $this->assertTrue($this->drupalGetHeader('Date'), 'An HTTP header was received.');
+    $this->assertTitle(t('Test page | @site-name', [
+      '@site-name' => $this->config('system.site')->get('name'),
+    ]));
+    $this->assertNoTitle('Foo');
+
+    $old_user_id = $this->container->get('current_user')->id();
+    $user = $this->drupalCreateUser();
+    $this->drupalLogin($user);
+    // Check that current user service updated.
+    $this->assertNotEqual($old_user_id, $this->container->get('current_user')->id(), 'Current user service updated.');
+    $headers = $this->drupalGetHeaders(TRUE);
+    $this->assertEqual(count($headers), 2, 'There was one intermediate request.');
+    $this->assertTrue(strpos($headers[0][':status'], '303') !== FALSE, 'Intermediate response code was 303.');
+    $this->assertFalse(empty($headers[0]['location']), 'Intermediate request contained a Location header.');
+    $this->assertEqual($this->getUrl(), $headers[0]['location'], 'HTTP redirect was followed');
+    $this->assertFalse($this->drupalGetHeader('Location'), 'Headers from intermediate request were reset.');
+    $this->assertResponse(200, 'Response code from intermediate request was reset.');
+
+    $this->drupalLogout();
+    // Check that current user service updated to anonymous user.
+    $this->assertEqual(0, $this->container->get('current_user')->id(), 'Current user service updated.');
+
+    // Test the maximum redirection option.
+    $this->maximumRedirects = 1;
+    $edit = [
+      'name' => $user->getUsername(),
+      'pass' => $user->pass_raw
+    ];
+    $this->drupalPostForm('user/login', $edit, t('Log in'), [
+      'query' => ['destination' => 'user/logout'],
+    ]);
+    $headers = $this->drupalGetHeaders(TRUE);
+    $this->assertEqual(count($headers), 2, 'Simpletest stopped following redirects after the first one.');
+
+    // Remove the Simpletest private key file so we can test the protection
+    // against requests that forge a valid testing user agent to gain access
+    // to the installer.
+    // @see drupal_valid_test_ua()
+    // Not using File API; a potential error must trigger a PHP warning.
+    unlink($this->siteDirectory . '/.htkey');
+    $this->drupalGet(Url::fromUri('base:core/install.php', ['external' => TRUE, 'absolute' => TRUE])->toString());
+    $this->assertResponse(403, 'Cannot access install.php.');
+  }
+
+  /**
+   * Test validation of the User-Agent header we use to perform test requests.
+   */
+  public function testUserAgentValidation() {
+    global $base_url;
+
+    // Logout the user which was logged in during test-setup.
+    $this->drupalLogout();
+
+    $system_path = $base_url . '/' . drupal_get_path('module', 'system');
+    $HTTP_path = $system_path . '/tests/http.php/user/login';
+    $https_path = $system_path . '/tests/https.php/user/login';
+    // Generate a valid simpletest User-Agent to pass validation.
+    $this->assertTrue(preg_match('/test\d+/', $this->databasePrefix, $matches), 'Database prefix contains test prefix.');
+    $test_ua = drupal_generate_test_ua($matches[0]);
+    $this->additionalCurlOptions = [CURLOPT_USERAGENT => $test_ua];
+
+    // Test pages only available for testing.
+    $this->drupalGet($HTTP_path);
+    $this->assertResponse(200, 'Requesting http.php with a legitimate simpletest User-Agent returns OK.');
+    $this->drupalGet($https_path);
+    $this->assertResponse(200, 'Requesting https.php with a legitimate simpletest User-Agent returns OK.');
+
+    // Now slightly modify the HMAC on the header, which should not validate.
+    $this->additionalCurlOptions = [CURLOPT_USERAGENT => $test_ua . 'X'];
+    $this->drupalGet($HTTP_path);
+    $this->assertResponse(403, 'Requesting http.php with a bad simpletest User-Agent fails.');
+    $this->drupalGet($https_path);
+    $this->assertResponse(403, 'Requesting https.php with a bad simpletest User-Agent fails.');
+
+    // Use a real User-Agent and verify that the special files http.php and
+    // https.php can't be accessed.
+    $this->additionalCurlOptions = [CURLOPT_USERAGENT => 'Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.12) Gecko/20101026 Firefox/3.6.12'];
+    $this->drupalGet($HTTP_path);
+    $this->assertResponse(403, 'Requesting http.php with a normal User-Agent fails.');
+    $this->drupalGet($https_path);
+    $this->assertResponse(403, 'Requesting https.php with a normal User-Agent fails.');
+  }
+
+  /**
+   * Tests that PHPUnit and KernelTestBase tests work through the UI.
+   */
+  public function testTestingThroughUI() {
+    $this->drupalGet('admin/config/development/testing');
+    $this->assertTrue(strpos($this->drupalSettings['simpleTest']['images'][0], 'core/misc/menu-collapsed.png') > 0, 'drupalSettings contains a link to core/misc/menu-collapsed.png.');
+    // We can not test WebTestBase tests here since they require a valid .htkey
+    // to be created. However this scenario is covered by the testception of
+    // \Drupal\simpletest\Tests\SimpleTestTest.
+
+    $tests = [
+      // A KernelTestBase test.
+      'Drupal\KernelTests\KernelTestBaseTest',
+      // A PHPUnit unit test.
+      'Drupal\Tests\action\Unit\Menu\ActionLocalTasksTest',
+      // A PHPUnit functional test.
+      ThroughUITest::class,
+    ];
+
+    foreach ($tests as $test) {
+      $this->drupalGet('admin/config/development/testing');
+      $edit = [
+        "tests[$test]" => TRUE,
+      ];
+      $this->drupalPostForm(NULL, $edit, t('Run tests'));
+      $this->assertText('0 fails, 0 exceptions');
+    }
+  }
+
+}